Oral appliance



FIG. 1 is a front perspective view of an oral appliance of a first embodiment of the design;

FIG. 2 is a front view of the oral appliance as shown in FIG. 1;

FIG. 3 is a rear view of the oral appliance as shown in FIG. 1;

FIG. 4 is a right side view of the oral appliance as shown in FIG. 1;

FIG. 5 is a left side view of the oral appliance as shown in FIG. 1;

FIG. 6 is a top plan view of the oral appliance as shown in FIG. 1;

FIG. 7 is a bottom plan view of the oral appliance as shown in FIG. 1;

FIG. 8 is a front perspective view of an oral appliance of a second embodiment of the design;

FIG. 9 is a front view of the oral appliance as shown in FIG. 8;

FIG. 10 is a rear view of the oral appliance as shown in FIG. 8;

FIG. 11 is a right side view of the oral appliance as shown in FIG. 8;

FIG. 12 is a left side view of the oral appliance as shown in FIG. 8;

FIG. 13 is a top plan view of the oral appliance as shown in FIG. 8; and,

FIG. 14 is a bottom plan view of the oral appliance as shown in FIG. 8. 

CLAIM The ornamental design for an oral appliance, as shown and described. 